Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e2e04526f542950…

MALICIOUS

PDF

78.8 KB Created: 2021-05-31 01:50:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4d8f228bf772234a831c47bf82c10578 SHA-1: 158517af8543b75a66d2a5813e3f952632b90f76 SHA-256: 5e2e04526f542950e9cfa214bba283a08d8286b8c232935fab8f2c6572699bfe
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://maypoin.ru/strik?utm_term=11th+grade+physical+science+book PDF link annotation
    • https://bumogekatagod.weebly.com/uploads/1/3/0/7/130776321/xonufexisu.pdfIn PDF document text
    • https://joxunirefebemi.weebly.com/uploads/1/3/4/3/134319414/vesetazozudopeb.pdfIn PDF document text
    • https://debeseroduk.weebly.com/uploads/1/3/4/4/134467522/xozatodo.pdfIn PDF document text
    • https://nowagomasililub.weebly.com/uploads/1/3/0/7/130775830/luzomidulokuwe_gizodadakipit_mimimegapa_niwifagawo.pdfIn PDF document text
    • https://jurumebaro.weebly.com/uploads/1/3/4/6/134625591/gevofelazutuxa_fosetonoroged.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481509/normal_604d15ffcb676.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416659/normal_6039e1742ea9b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490129/normal_60417eacb0ecc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459174/normal_5ffcc06b743c5.pdfIn PDF document text
    • https://sonojija.weebly.com/uploads/1/3/4/7/134723635/fef9e3cfa.pdfIn PDF document text
    • https://jowatoziji.weebly.com/uploads/1/3/4/8/134893097/fixexute_mejanigubuzafep_litafap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458615/normal_5fe863966ed72.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371790/normal_5ff76963ce30f.pdfIn PDF document text
    • https://nakowubolitek.weebly.com/uploads/1/3/5/3/135349387/gijowor-wiwaxewaxijalu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448995/normal_603ec85b0c96e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/42acf77b-9c3c-41f2-9b20-39e68b640c5e/46762922475.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/452704e6-5318-4a15-be18-82f44551435a/robum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f868113-819f-4049-af41-0d1f5ccea8c0/32363119689.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5df2475-c40a-4ddf-9455-7e81b31d42f0/28361533355.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/151e9161-c428-4cf5-b0ae-977303ac72c6/amplifier_troubleshooting_flowchart.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A2 5600 bytes
SHA-256: b028d7e3ec90ce0b42498fcf499bf141fe78e163655665c37af5d0cc5a36e862
font_01_sfnt_off000108a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A9 11016 bytes
SHA-256: cae6b9942a12ff899949fed416b0cfb92d664c5f8e0bd09b089770b9d02044c3

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